Friction welding

Friction welding is a type of solid-state welding. Solid-state welding means that the welding is done without melting the parts under work and only through the application of heat and pressure. In friction welding, the friction between the parts is used as a heat source. In a friction welding process, the two parts to be welded are moved relatively towards each other to generate friction. This friction generates heat and raises the temperature of both parts. Once the interface temperature reaches the hot working range of the metals under work, the rotation is stopped and pressure is applied to drive the parts toward each other. A metallurgical bond is produced as a result. The pressure disturbs the part geometry and pushes some material out, known as flash, which needs to be trimmed. Friction welding is usually used in automotive, petroleum, natural gas, and aircraft industry.